Changing timestamp format, Nested Diagnostic Context and custom msg handlers

log4bash.sh

@@ -14,6 +14,18 @@ SCRIPT_NAME="${SCRIPT_NAME#\./}"
 SCRIPT_NAME="${SCRIPT_NAME##/*/}"
 SCRIPT_BASE_DIR="$(cd "$( dirname "$0")" && pwd )"
 
+#
+# Configuration settings
+#
+
+# The default time format string
+log4bash_timefmt="+%Y-%m-%d %H:%M:%S %Z"
+
+# The default list of log handler functions
+log4bash_handlers=("log_echo")
+
+context=()
+
 # This should probably be the right way - didn't have time to experiment though
 # declare -r INTERACTIVE_MODE="$([ tty --silent ] && echo on || echo off)"
 declare -r INTERACTIVE_MODE=$([ "$(uname)" == "Darwin" ] && echo "on" || echo "off")
@@ -61,6 +73,28 @@ prepare_log_for_nonterminal() {
     sed "s/[[:cntrl:]]\[[0-9;]*m//g"
 }
 
+context_push() {
+    while [ "$1" ]; do
+        context+=($1); shift
+    done
+}
+
+context_pop() {
+    unset context[${#context[@]}-1]
+}
+
+join_by() {
+    local IFS="$1"; shift
+    echo "$*"
+}
+
+#
+# Handlers
+#
+log_echo() {
+    echo -e "$*"
+}
+
 log() {
     local log_text="$1"
     local log_level="$2"
@@ -70,7 +104,14 @@ log() {
     [[ -z ${log_level} ]] && log_level="INFO";
     [[ -z ${log_color} ]] && log_color="${LOG_INFO_COLOR}";
 
-    echo -e "${log_color}[$(date +"%Y-%m-%d %H:%M:%S %Z")] [${log_level}] ${log_text} ${LOG_DEFAULT_COLOR}";
+    # First build the log message
+    msg="${log_color}$(join_by ' ' [$(date "${log4bash_timefmt}")] [${log_level}] ${context[@]} ${log_text})${LOG_DEFAULT_COLOR}";
+
+    # And then dispatch it to handlers
+    for handler in ${log4bash_handlers[@]}; do
+        eval $handler \"$msg\"
+    done
+
     return 0;
 }
 

tests/bashful.sh

@@ -22,3 +22,41 @@ log_captains "What was in the captain's toilet?";
 
 # If you have the "say" command (e.g. on a Mac)
 log_speak "Resistance is futile";
+
+#
+# Now for an example how we can change the timestamp format
+#
+log4bash_timefmt="+%Y-%m-%dT%H:%M:%S%z";
+
+log_info "ISO-8601 master race! Exterminate!";
+
+#
+# How to use a context stack
+#
+log_info "Starting blobalizer";
+
+context_push "blobalizer_started";
+
+log_warning "We are beginning task";
+
+context_push "task1";
+
+log_success "Task has ended";
+
+context_pop;
+
+log_info "Taking another task from queue";
+
+#
+# Now to add some new handlers
+#
+
+log_syslog() {
+	logger "$*" 
+}
+
+# Add the handler at the end of the chain
+log4bash_handlers+=("log_syslog")
+
+log_info "This message will also be logged to syslog, check it now"
+